<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">
        <div ref="mydiv">{{num}}</div>
        <button @click="getnum">点击我改变num的值</button>
    </div>
    <script>
        new Vue({
            el:"#app",
            data:{
                num:1
            },
            methods:{
                getnum(){
                    this.num++;
                    console.log(this.$refs.mydiv.innerHTML);
                    console.log(this.num);
                }
            }
        })


    </script>
</body>
</html>